Al Sa'fat 2.0 U-Value Calculator Dubai 2026: The Compliance Guide

Al Sa'fat is Dubai Municipality's green building rating system, structured in four tiers — Bronze, Silver, Gold, and Platinum. As of the current Dubai Building Code cycle, Silver is the mandatory minimum for all new building permits and major renovations submitted through BPS — Bronze is no longer accepted as a standalone submission tier for new work.

Silver-tier compliance is assessed across several categories, but the building envelope's thermal performance — measured through U-value — is the category most consultants underestimate, because it requires an actual calculation submitted with the drawing set, not just a checkbox declaration.

The U-value of a wall, roof, or glazing assembly is calculated from the thermal resistance (R-value) of every material layer in that assembly — insulation thickness and type, block or panel material, render, and any air gaps — combined into a single transmittance figure expressed in W/m²K. Lower is better.

The calculation must reflect the actual specified materials in your construction drawings — a generic or assumed U-value copied from a previous project is one of the most common reasons a submission gets flagged, because DM's technical reviewers cross-check the submitted U-value calculation against the material specification shown in the architectural and structural drawing set. If the insulation thickness noted in your calculation doesn't match the thickness shown in the wall section detail, the mismatch itself is a rejection trigger — independent of whether either number would individually pass.

• Wall assemblies — most common failure point is insufficient insulation thickness specified for the exterior wall build-up, often because a contractor's standard block-and-render detail predates the current Silver-tier requirement
• Roof assemblies — flat roofs in particular need the insulation layer's U-value contribution calculated separately from any waterproofing membrane, which is frequently omitted from the submitted calculation
• Glazing — window and curtain wall glazing has its own U-value (and separate solar heat gain coefficient) requirement distinct from the wall calculation; submitting only a wall U-value calculation while omitting glazing is a common incomplete-submission trigger
• Thermal bridging at junctions — balcony slabs, parapet junctions, and window reveals can undermine an otherwise-compliant wall U-value if the thermal break at the junction isn't detailed separately

The most reliable approach is to have the U-value calculation prepared by the same consultant producing the architectural and structural drawing set — not as a separate add-on report — so the specified material thicknesses match exactly across every document in the submission.

A complete Al Sa'fat 2.0 Silver U-value submission for a typical commercial or residential building includes: a wall assembly U-value calculation matched to the wall section detail, a roof assembly U-value calculation matched to the roof detail, a glazing U-value and SHGC declaration matched to the window/curtain wall schedule, and a summary sheet cross-referencing all three against the Silver-tier thresholds for the relevant building typology.

Dar Al Naseeb prepares Al Sa'fat 2.0 U-value calculations as a standard part of every DM building permit submission — not a separate service — specifically because the cross-document consistency is what BPS review actually checks.